gdbserver: Document problem and workaround for client remote timeouts
gdbserver: Document problem and workaround for client remote timeouts

gdbserver does not robustly deal with the gdb client timing out
and re-sending packets.

Signed-off-by: Nicholas Piggin <24829078df5003d9dd1dd871ca2aeb0b1cf95ef4@gmail.com>
Signed-off-by: Joel Stanley <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@jms.id.au>

open-power/pdbg,open-power/pdbg,open-power/pdbg